What is the VMware Platform Services Controller? With vSphere 6, VMware updated the architecture for vCenter. One of those changes was the introduction of the Platform Services Controller, or PSC. The PSC combines a number of components, including those that used to be deployed independently, like vCenter Single Sign-On, or were part of vCenter, such as the license service, into a single product. This simplifies deployment and allows vCenter to be a more focused product itself.
Under the Hood
So what's actually included in the Platform Services Controller? Here's the official list:
VMware Appliance Management Service*
VMware Authentication Framework
VMware Certificate Service
VMware Common Logging Service
VMware Component Manager
VMware Directory Service
VMware HTTP Reverse Proxy
VMware Identity Management Service
VMware License Service
VMware Security Token Service
VMware Service Control Agent
VMware Syslog Health Service
* Only when PSC is deployed as an appliance. ↩
The little footnote above hints that PSC can be deployed as an appliance, but isn't restricted to that. Indeed, PSC can be deployed either as a virtual appliance or on a Windows Server based system, either physical or virtual. That's just the start of all the deployment permutations possible for PSC.
That Poor Cat
So PSC can be an appliance or installed on Windows Server. Typically you'll find that it's convenient to mirror the approach you're taking with vCenter, which can also be deployed as an appliance or installed on Windows Server. If you were to ask me, I'd strive to go with the appliance model. There are less licensing concerns about operating systems and databases, and VMware has some appliance-exclusive features on the horizon.
After the appliance vs. Windows Server decision is made (go appliance!), there are still many ways to skin the PSC deployment. Let's look at VMware's recommended topologies for PSC and vCenter. Needless to say, the titles I use here for the topologies are my own, and do not come from VMware. So fair warning if you use them while on a support call and meet an uncomfortable silence on the line.
The Lone Wolf
A single deployment including both vCenter and PSC on the same box. The simplest, and least fault tolerant, deployment you can pick.
Scenario:
Path to Multiple Fault Domains
Scale out the vCenters! This adds a bit of load distribution by accounting for one or more vCenter servers. Still has single points of failure.
Scenario:
Path 2 Multiple Fault Domains 2: 2's Company
We can now accommodate multiple sites. This provides service locality within the sites, as well as allowing us to split the guests between multiple vCenters.
Scenario:
With a Little Help From My Friends
This model introduces a third-party load balancer into the mix, but we're back to a single site. Note that the load balancer is for handling connections to the PSC instances. This provides high availability for the PSC's, but alas, HA for vCenter still eludes us.
Scenario:
Getting the Band Back Together
Extending the load balancer approach to multiple sites.
Scenario:
How to Lose Friends And…
Somewhere along the way we've lost the load balancers. This model effectively provides a dedicated PSC per vCenter. A bit heavy, but does the trick if you don't have, or don't want to rely on, third party load balancers.
Scenario:
Romancing the Keystone
Looking at the topologies, even the way they're drawn, it's clear that PSC is the keystone to a successfully deployed vSphere environment. vCenter and a whole raft of other VMware products depend on its components to get do their job. Being familiar with the PSC, what it is and how it's deployed, will serve you well as you design and work with your vSphere environments.
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